/Engine/Plugins/Runtime/SmartObjects/Source/SmartObjectsModule/Public/SmartObjectTypes.h
Describes how Smart Object or slot was changed.
enum ESmartObjectChangeReason { None, OnEvent, OnTagAdded, OnTagRemoved, OnClaimed, OnOccupied, OnReleased, OnSlotEnabled, OnSlotDisabled, OnObjectEnabled, OnObjectDisabled, }